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Segment Information - Segment Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net revenues	$ 54,462	$ 46,027
Income (loss) from operations	(1,378)	(5,429)
Total assets	156,571	151,910	$ 154,067
Depreciation and amortization	2,157	2,195
Operating Segments [Member] | BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	37,535	36,869
Income (loss) from operations	1,420	1,506
Total assets	206,812	176,502
Depreciation and amortization	973	1,119
Operating Segments [Member] | VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	12,922	7,747
Income (loss) from operations	(3,920)	(5,708)
Total assets	22,736	17,247
Depreciation and amortization	629	584
Operating Segments [Member] | Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	6,858	2,955
Income (loss) from operations	1,368	(1,004)
Total assets	10,268	5,724
Depreciation and amortization	180	126
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(246)	(223)
Total assets	69,507	77,569
Depreciation and amortization	375	366
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	(2,853)	(1,544)
Total assets	$ (152,752)	$ (125,132)

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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